About the Authors

Stephanie J. Grainger

Affiliation Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America

Andrew J. Putnam

putnam@umich.edu

Affiliation Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, United States of America

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: SJG AJP. Performed the experiments: SJG. Analyzed the data: SJG AJP. Contributed reagents/materials/analysis tools: SJG AJP. Wrote the paper: SJG AJP.